/*
* winstore.c: Windows-specific implementation of the interface
* defined in storage.h.
*/

#include <stdio.h>
#include <stdlib.h>
#include <limits.h>
#include <assert.h>
#include "putty.h"
#include "storage.h"

#include <shlobj.h>
#ifndef CSIDL_APPDATA
#define CSIDL_APPDATA 0x001a
#endif
#ifndef CSIDL_LOCAL_APPDATA
#define CSIDL_LOCAL_APPDATA 0x001c
#endif

static const char *const reg_jumplist_key = PUTTY_REG_POS "\\Jumplist";
static const char *const reg_jumplist_value = "Recent sessions";
static const char *const puttystr = PUTTY_REG_POS "\\Sessions";

static const char hex[16] = "0123456789ABCDEF";

static int tried_shgetfolderpath = FALSE;
static HMODULE shell32_module = NULL;
DECL_WINDOWS_FUNCTION(static, HRESULT, SHGetFolderPathA, 
	(HWND, int, HANDLE, DWORD, LPSTR));

static void mungestr(const char *in, char *out)
{
	int candot = 0;

	while (*in) {
		if (*in == ' ' || *in == '\\' || *in == '*' || *in == '?' ||
			*in == '%' || *in < ' ' || *in > '~' || (*in == '.'
			&& !candot)) {
				*out++ = '%';
				*out++ = hex[((unsigned char) *in) >> 4];
				*out++ = hex[((unsigned char) *in) & 15];
		} else
			*out++ = *in;
		in++;
		candot = 1;
	}
	*out = '\0';
	return;
}

static void unmungestr(const char *in, char *out, int outlen)
{
	while (*in) {
		if (*in == '%' && in[1] && in[2]) {
			int i, j;

			i = in[1] - '0';
			i -= (i > 9 ? 7 : 0);
			j = in[2] - '0';
			j -= (j > 9 ? 7 : 0);

			*out++ = (i << 4) + j;
			if (!--outlen)
				return;
			in += 3;
		} else {
			*out++ = *in++;
			if (!--outlen)
				return;
		}
	}
	*out = '\0';
	return;
}

void *open_settings_w(const char *sessionname, char **errmsg)
{
	HKEY subkey1, sesskey;
	int ret;
	char *p;

	*errmsg = NULL;

	if (!sessionname || !*sessionname)
		sessionname = "Default Settings";

	p = snewn(3 * strlen(sessionname) + 1, char);
	mungestr(sessionname, p);

	ret = RegCreateKey(HKEY_CURRENT_USER, puttystr, &subkey1);
	if (ret != ERROR_SUCCESS) {
		sfree(p);
		*errmsg = dupprintf("Unable to create registry key\n"
			"HKEY_CURRENT_USER\\%s", puttystr);
		return NULL;
	}
	ret = RegCreateKey(subkey1, p, &sesskey);
	RegCloseKey(subkey1);
	if (ret != ERROR_SUCCESS) {
		*errmsg = dupprintf("Unable to create registry key\n"
			"HKEY_CURRENT_USER\\%s\\%s", puttystr, p);
		sfree(p);
		return NULL;
	}
	sfree(p);
	return (void *) sesskey;
}

void write_setting_s(void *handle, const char *key, const char *value)
{
	if (handle)
		RegSetValueEx((HKEY) handle, key, 0, REG_SZ, (CONST BYTE *)value,
		1 + strlen(value));
}

void write_setting_i(void *handle, const char *key, int value)
{
	if (handle)
		RegSetValueEx((HKEY) handle, key, 0, REG_DWORD,
		(CONST BYTE *) &value, sizeof(value));
}

void close_settings_w(void *handle)
{
	RegCloseKey((HKEY) handle);
}

void *open_settings_r(const char *sessionname)
{
	HKEY subkey1, sesskey;
	char *p;

	if (!sessionname || !*sessionname)
		sessionname = "Default Settings";

	p = snewn(3 * strlen(sessionname) + 1, char);
	mungestr(sessionname, p);

	if (RegOpenKey(HKEY_CURRENT_USER, puttystr, &subkey1) != ERROR_SUCCESS) {
		sesskey = NULL;
	} else {
		if (RegOpenKey(subkey1, p, &sesskey) != ERROR_SUCCESS) {
			sesskey = NULL;
		}
		RegCloseKey(subkey1);
	}

	sfree(p);

	return (void *) sesskey;
}

char *read_setting_s(void *handle, const char *key)
{
	DWORD type, allocsize, size;
	char *ret;

	if (!handle)
		return NULL;

	/* Find out the type and size of the data. */
	if (RegQueryValueEx((HKEY) handle, key, 0,
		&type, NULL, &size) != ERROR_SUCCESS ||
		type != REG_SZ)
		return NULL;

	allocsize = size+1;         /* allow for an extra NUL if needed */
	ret = snewn(allocsize, char);
	if (RegQueryValueEx((HKEY) handle, key, 0,
		&type, (BYTE *)ret, &size) != ERROR_SUCCESS ||
		type != REG_SZ) {
			sfree(ret);
			return NULL;
	}
	assert(size < allocsize);
	ret[size] = '\0'; /* add an extra NUL in case RegQueryValueEx
					  * didn't supply one */

	return ret;
}

int read_setting_i(void *handle, const char *key, int defvalue)
{
	DWORD type, val, size;
	size = sizeof(val);

	if (!handle ||
		RegQueryValueEx((HKEY) handle, key, 0, &type,
		(BYTE *) &val, &size) != ERROR_SUCCESS ||
		size != sizeof(val) || type != REG_DWORD)
		return defvalue;
	else
		return val;
}

FontSpec *read_setting_fontspec(void *handle, const char *name)
{
	char *settingname;
	char *fontname;
	FontSpec *ret;
	int isbold, height, charset;

	fontname = read_setting_s(handle, name);
	if (!fontname)
		return NULL;

	settingname = dupcat(name, "IsBold", NULL);
	isbold = read_setting_i(handle, settingname, -1);
	sfree(settingname);
	if (isbold == -1) {
		sfree(fontname);
		return NULL;
	}

	settingname = dupcat(name, "CharSet", NULL);
	charset = read_setting_i(handle, settingname, -1);
	sfree(settingname);
	if (charset == -1) {
		sfree(fontname);
		return NULL;
	}

	settingname = dupcat(name, "Height", NULL);
	height = read_setting_i(handle, settingname, INT_MIN);
	sfree(settingname);
	if (height == INT_MIN) {
		sfree(fontname);
		return NULL;
	}

	ret = fontspec_new(fontname, isbold, height, charset);
	sfree(fontname);
	return ret;
}

void write_setting_fontspec(void *handle, const char *name, FontSpec *font)
{
	char *settingname;

	write_setting_s(handle, name, font->name);
	settingname = dupcat(name, "IsBold", NULL);
	write_setting_i(handle, settingname, font->isbold);
	sfree(settingname);
	settingname = dupcat(name, "CharSet", NULL);
	write_setting_i(handle, settingname, font->charset);
	sfree(settingname);
	settingname = dupcat(name, "Height", NULL);
	write_setting_i(handle, settingname, font->height);
	sfree(settingname);
}

Filename *read_setting_filename(void *handle, const char *name)
{
	char *tmp = read_setting_s(handle, name);
	if (tmp) {
		Filename *ret = filename_from_str(tmp);
		sfree(tmp);
		return ret;
	} else
		return NULL;
}

void write_setting_filename(void *handle, const char *name, Filename *result)
{
	write_setting_s(handle, name, result->path);
}

void close_settings_r(void *handle)
{
	RegCloseKey((HKEY) handle);
}

void del_settings(const char *sessionname)
{
	HKEY subkey1;
	char *p;

	if (RegOpenKey(HKEY_CURRENT_USER, puttystr, &subkey1) != ERROR_SUCCESS)
		return;

	p = snewn(3 * strlen(sessionname) + 1, char);
	mungestr(sessionname, p);
	RegDeleteKey(subkey1, p);
	sfree(p);

	RegCloseKey(subkey1);

	remove_session_from_jumplist(sessionname);
}

struct enumsettings {
	HKEY key;
	int i;
};

void *enum_settings_start(void)
{
	struct enumsettings *ret;
	HKEY key;

	if (RegOpenKey(HKEY_CURRENT_USER, puttystr, &key) != ERROR_SUCCESS)
		return NULL;

	ret = snew(struct enumsettings);
	if (ret) {
		ret->key = key;
		ret->i = 0;
	}

	return ret;
}

char *enum_settings_next(void *handle, char *buffer, int buflen)
{
	struct enumsettings *e = (struct enumsettings *) handle;
	char *otherbuf;
	otherbuf = snewn(3 * buflen, char);
	if (RegEnumKey(e->key, e->i++, otherbuf, 3 * buflen) == ERROR_SUCCESS) {
		unmungestr(otherbuf, buffer, buflen);
		sfree(otherbuf);
		return buffer;
	} else {
		sfree(otherbuf);
		return NULL;
	}
}

void enum_settings_finish(void *handle)
{
	struct enumsettings *e = (struct enumsettings *) handle;
	RegCloseKey(e->key);
	sfree(e);
}

static void hostkey_regname(char *buffer, const char *hostname,
	int port, const char *keytype)
{
	int len;
	strcpy(buffer, keytype);
	strcat(buffer, "@");
	len = strlen(buffer);
	len += sprintf(buffer + len, "%d:", port);
	mungestr(hostname, buffer + strlen(buffer));
}

int verify_host_key(const char *hostname, int port,
	const char *keytype, const char *key)
{
	char *otherstr, *regname;
	int len;
	HKEY rkey;
	DWORD readlen;
	DWORD type;
	int ret, compare;

	len = 1 + strlen(key);

	/*
	* Now read a saved key in from the registry and see what it
	* says.
	*/
	regname = snewn(3 * (strlen(hostname) + strlen(keytype)) + 15, char);

	hostkey_regname(regname, hostname, port, keytype);

	if (RegOpenKey(HKEY_CURRENT_USER, PUTTY_REG_POS "\\SshHostKeys",
		&rkey) != ERROR_SUCCESS) {
			sfree(regname);
			return 1;		       /* key does not exist in registry */
	}

	readlen = len;
	otherstr = snewn(len, char);
	ret = RegQueryValueEx(rkey, regname, NULL,
		&type, (BYTE *)otherstr, &readlen);

	if (ret != ERROR_SUCCESS && ret != ERROR_MORE_DATA &&
		!strcmp(keytype, "rsa")) {
			/*
			* Key didn't exist. If the key type is RSA, we'll try
			* another trick, which is to look up the _old_ key format
			* under just the hostname and translate that.
			*/
			char *justhost = regname + 1 + strcspn(regname, ":");
			char *oldstyle = snewn(len + 10, char);	/* safety margin */
			readlen = len;
			ret = RegQueryValueEx(rkey, justhost, NULL, &type,
				(BYTE *)oldstyle, &readlen);

			if (ret == ERROR_SUCCESS && type == REG_SZ) {
				/*
				* The old format is two old-style bignums separated by
				* a slash. An old-style bignum is made of groups of
				* four hex digits: digits are ordered in sensible
				* (most to least significant) order within each group,
				* but groups are ordered in silly (least to most)
				* order within the bignum. The new format is two
				* ordinary C-format hex numbers (0xABCDEFG...XYZ, with
				* A nonzero except in the special case 0x0, which
				* doesn't appear anyway in RSA keys) separated by a
				* comma. All hex digits are lowercase in both formats.
				*/
				char *p = otherstr;
				char *q = oldstyle;
				int i, j;

				for (i = 0; i < 2; i++) {
					int ndigits, nwords;
					*p++ = '0';
					*p++ = 'x';
					ndigits = strcspn(q, "/");	/* find / or end of string */
					nwords = ndigits / 4;
					/* now trim ndigits to remove leading zeros */
					while (q[(ndigits - 1) ^ 3] == '0' && ndigits > 1)
						ndigits--;
					/* now move digits over to new string */
					for (j = 0; j < ndigits; j++)
						p[ndigits - 1 - j] = q[j ^ 3];
					p += ndigits;
					q += nwords * 4;
					if (*q) {
						q++;	       /* eat the slash */
						*p++ = ',';	       /* add a comma */
					}
					*p = '\0';	       /* terminate the string */
				}

				/*
				* Now _if_ this key matches, we'll enter it in the new
				* format. If not, we'll assume something odd went
				* wrong, and hyper-cautiously do nothing.
				*/
				if (!strcmp(otherstr, key))
					RegSetValueEx(rkey, regname, 0, REG_SZ, (BYTE *)otherstr,
					strlen(otherstr) + 1);
			}

			sfree(oldstyle);
	}

	RegCloseKey(rkey);

	compare = strcmp(otherstr, key);

	sfree(otherstr);
	sfree(regname);

	if (ret == ERROR_MORE_DATA ||
		(ret == ERROR_SUCCESS && type == REG_SZ && compare))
		return 2;		       /* key is different in registry */
	else if (ret != ERROR_SUCCESS || type != REG_SZ)
		return 1;		       /* key does not exist in registry */
	else
		return 0;		       /* key matched OK in registry */
}

int have_ssh_host_key(const char *hostname, int port,
	const char *keytype)
{
	/*
	* If we have a host key, verify_host_key will return 0 or 2.
	* If we don't have one, it'll return 1.
	*/
	return verify_host_key(hostname, port, keytype, "") != 1;
}

void store_host_key(const char *hostname, int port,
	const char *keytype, const char *key)
{
	char *regname;
	HKEY rkey;

	regname = snewn(3 * (strlen(hostname) + strlen(keytype)) + 15, char);

	hostkey_regname(regname, hostname, port, keytype);

	if (RegCreateKey(HKEY_CURRENT_USER, PUTTY_REG_POS "\\SshHostKeys",
		&rkey) == ERROR_SUCCESS) {
			RegSetValueEx(rkey, regname, 0, REG_SZ, (BYTE *)key, strlen(key) + 1);
			RegCloseKey(rkey);
	} /* else key does not exist in registry */

	sfree(regname);
}

/*
* Open (or delete) the random seed file.
*/
enum { DEL, OPEN_R, OPEN_W };
static int try_random_seed(char const *path, int action, HANDLE *ret)
{
	if (action == DEL) {
		if (!DeleteFile(path) && GetLastError() != ERROR_FILE_NOT_FOUND) {
			nonfatal("Unable to delete '%s': %s", path,
				win_strerror(GetLastError()));
		}
		*ret = INVALID_HANDLE_VALUE;
		return FALSE;		       /* so we'll do the next ones too */
	}

	*ret = CreateFile(path,
		action == OPEN_W ? GENERIC_WRITE : GENERIC_READ,
		action == OPEN_W ? 0 : (FILE_SHARE_READ |
		FILE_SHARE_WRITE),
		NULL,
		action == OPEN_W ? CREATE_ALWAYS : OPEN_EXISTING,
		action == OPEN_W ? FILE_ATTRIBUTE_NORMAL : 0,
		NULL);

	return (*ret != INVALID_HANDLE_VALUE);
}

static HANDLE access_random_seed(int action)
{
	HKEY rkey;
	DWORD type, size;
	HANDLE rethandle;
	char seedpath[2 * MAX_PATH + 10] = "\0";

	/*
	* Iterate over a selection of possible random seed paths until
	* we find one that works.
	* 
	* We do this iteration separately for reading and writing,
	* meaning that we will automatically migrate random seed files
	* if a better location becomes available (by reading from the
	* best location in which we actually find one, and then
	* writing to the best location in which we can _create_ one).
	*/

	/*
	* First, try the location specified by the user in the
	* Registry, if any.
	*/
	size = sizeof(seedpath);
	if (RegOpenKey(HKEY_CURRENT_USER, PUTTY_REG_POS, &rkey) ==
		ERROR_SUCCESS) {
			int ret = RegQueryValueEx(rkey, "RandSeedFile",
				0, &type, (BYTE *)seedpath, &size);
			if (ret != ERROR_SUCCESS || type != REG_SZ)
				seedpath[0] = '\0';
			RegCloseKey(rkey);

			if (*seedpath && try_random_seed(seedpath, action, &rethandle))
				return rethandle;
	}

	/*
	* Next, try the user's local Application Data directory,
	* followed by their non-local one. This is found using the
	* SHGetFolderPath function, which won't be present on all
	* versions of Windows.
	*/
	if (!tried_shgetfolderpath) {
		/* This is likely only to bear fruit on systems with IE5+
		* installed, or WinMe/2K+. There is some faffing with
		* SHFOLDER.DLL we could do to try to find an equivalent
		* on older versions of Windows if we cared enough.
		* However, the invocation below requires IE5+ anyway,
		* so stuff that. */
		shell32_module = load_system32_dll("shell32.dll");
		GET_WINDOWS_FUNCTION(shell32_module, SHGetFolderPathA);
		tried_shgetfolderpath = TRUE;
	}
	if (p_SHGetFolderPathA) {
		if (SUCCEEDED(p_SHGetFolderPathA(NULL, CSIDL_LOCAL_APPDATA,
			NULL, SHGFP_TYPE_CURRENT, seedpath))) {
				strcat(seedpath, "\\PUTTY.RND");
				if (try_random_seed(seedpath, action, &rethandle))
					return rethandle;
		}

		if (SUCCEEDED(p_SHGetFolderPathA(NULL, CSIDL_APPDATA,
			NULL, SHGFP_TYPE_CURRENT, seedpath))) {
				strcat(seedpath, "\\PUTTY.RND");
				if (try_random_seed(seedpath, action, &rethandle))
					return rethandle;
		}
	}

	/*
	* Failing that, try %HOMEDRIVE%%HOMEPATH% as a guess at the
	* user's home directory.
	*/
	{
		int len, ret;

		len =
			GetEnvironmentVariable("HOMEDRIVE", seedpath,
			sizeof(seedpath));
		ret =
			GetEnvironmentVariable("HOMEPATH", seedpath + len,
			sizeof(seedpath) - len);
		if (ret != 0) {
			strcat(seedpath, "\\PUTTY.RND");
			if (try_random_seed(seedpath, action, &rethandle))
				return rethandle;
		}
	}

	/*
	* And finally, fall back to C:\WINDOWS.
	*/
	GetWindowsDirectory(seedpath, sizeof(seedpath));
	strcat(seedpath, "\\PUTTY.RND");
	if (try_random_seed(seedpath, action, &rethandle))
		return rethandle;

	/*
	* If even that failed, give up.
	*/
	return INVALID_HANDLE_VALUE;
}

void read_random_seed(noise_consumer_t consumer)
{
	HANDLE seedf = access_random_seed(OPEN_R);

	if (seedf != INVALID_HANDLE_VALUE) {
		while (1) {
			char buf[1024];
			DWORD len;

			if (ReadFile(seedf, buf, sizeof(buf), &len, NULL) && len)
				consumer(buf, len);
			else
				break;
		}
		CloseHandle(seedf);
	}
}

void write_random_seed(void *data, int len)
{
	HANDLE seedf = access_random_seed(OPEN_W);

	if (seedf != INVALID_HANDLE_VALUE) {
		DWORD lenwritten;

		WriteFile(seedf, data, len, &lenwritten, NULL);
		CloseHandle(seedf);
	}
}

/*
* Internal function supporting the jump list registry code. All the
* functions to add, remove and read the list have substantially
* similar content, so this is a generalisation of all of them which
* transforms the list in the registry by prepending 'add' (if
* non-null), removing 'rem' from what's left (if non-null), and
* returning the resulting concatenated list of strings in 'out' (if
* non-null).
*/
static int transform_jumplist_registry
	(const char *add, const char *rem, char **out)
{
	int ret;
	HKEY pjumplist_key, psettings_tmp;
	DWORD type;
	DWORD value_length;
	char *old_value, *new_value;
	char *piterator_old, *piterator_new, *piterator_tmp;

	ret = RegCreateKeyEx(HKEY_CURRENT_USER, reg_jumplist_key, 0, NULL,
		REG_OPTION_NON_VOLATILE, (KEY_READ | KEY_WRITE), NULL,
		&pjumplist_key, NULL);
	if (ret != ERROR_SUCCESS) {
		return JUMPLISTREG_ERROR_KEYOPENCREATE_FAILURE;
	}

	/* Get current list of saved sessions in the registry. */
	value_length = 200;
	old_value = snewn(value_length, char);
	ret = RegQueryValueEx(pjumplist_key, reg_jumplist_value, NULL, &type,
		(BYTE *)old_value, &value_length);
	/* When the passed buffer is too small, ERROR_MORE_DATA is
	* returned and the required size is returned in the length
	* argument. */
	if (ret == ERROR_MORE_DATA) {
		sfree(old_value);
		old_value = snewn(value_length, char);
		ret = RegQueryValueEx(pjumplist_key, reg_jumplist_value, NULL, &type,
			(BYTE *)old_value, &value_length);
	}

	if (ret == ERROR_FILE_NOT_FOUND) {
		/* Value doesn't exist yet. Start from an empty value. */
		*old_value = '\0';
		*(old_value + 1) = '\0';
	} else if (ret != ERROR_SUCCESS) {
		/* Some non-recoverable error occurred. */
		sfree(old_value);
		RegCloseKey(pjumplist_key);
		return JUMPLISTREG_ERROR_VALUEREAD_FAILURE;
	} else if (type != REG_MULTI_SZ) {
		/* The value present in the registry has the wrong type: we
		* try to delete it and start from an empty value. */
		ret = RegDeleteValue(pjumplist_key, reg_jumplist_value);
		if (ret != ERROR_SUCCESS) {
			sfree(old_value);
			RegCloseKey(pjumplist_key);
			return JUMPLISTREG_ERROR_VALUEREAD_FAILURE;
		}

		*old_value = '\0';
		*(old_value + 1) = '\0';
	}

	/* Check validity of registry data: REG_MULTI_SZ value must end
	* with \0\0. */
	piterator_tmp = old_value;
	while (((piterator_tmp - old_value) < (value_length - 1)) &&
		!(*piterator_tmp == '\0' && *(piterator_tmp+1) == '\0')) {
			++piterator_tmp;
	}

	if ((piterator_tmp - old_value) >= (value_length-1)) {
		/* Invalid value. Start from an empty value. */
		*old_value = '\0';
		*(old_value + 1) = '\0';
	}

	/*
	* Modify the list, if we're modifying.
	*/
	if (add || rem) {
		/* Walk through the existing list and construct the new list of
		* saved sessions. */
		new_value = snewn(value_length + (add ? strlen(add) + 1 : 0), char);
		piterator_new = new_value;
		piterator_old = old_value;

		/* First add the new item to the beginning of the list. */
		if (add) {
			strcpy(piterator_new, add);
			piterator_new += strlen(piterator_new) + 1;
		}
		/* Now add the existing list, taking care to leave out the removed
		* item, if it was already in the existing list. */
		while (*piterator_old != '\0') {
			if (!rem || strcmp(piterator_old, rem) != 0) {
				/* Check if this is a valid session, otherwise don't add. */
				psettings_tmp = open_settings_r(piterator_old);
				if (psettings_tmp != NULL) {
					close_settings_r(psettings_tmp);
					strcpy(piterator_new, piterator_old);
					piterator_new += strlen(piterator_new) + 1;
				}
			}
			piterator_old += strlen(piterator_old) + 1;
		}
		*piterator_new = '\0';
		++piterator_new;

		/* Save the new list to the registry. */
		ret = RegSetValueEx(pjumplist_key, reg_jumplist_value, 0, REG_MULTI_SZ,
			(BYTE *)new_value, piterator_new - new_value);

		sfree(old_value);
		old_value = new_value;
	} else
		ret = ERROR_SUCCESS;

	/*
	* Either return or free the result.
	*/
	if (out && ret == ERROR_SUCCESS)
		*out = old_value;
	else
		sfree(old_value);

	/* Clean up and return. */
	RegCloseKey(pjumplist_key);

	if (ret != ERROR_SUCCESS) {
		return JUMPLISTREG_ERROR_VALUEWRITE_FAILURE;
	} else {
		return JUMPLISTREG_OK;
	}
}

/* Adds a new entry to the jumplist entries in the registry. */
int add_to_jumplist_registry(const char *item)
{
	return transform_jumplist_registry(item, item, NULL);
}

/* Removes an item from the jumplist entries in the registry. */
int remove_from_jumplist_registry(const char *item)
{
	return transform_jumplist_registry(NULL, item, NULL);
}

/* Returns the jumplist entries from the registry. Caller must free
* the returned pointer. */
char *get_jumplist_registry_entries (void)
{
	char *list_value;

	if (transform_jumplist_registry(NULL,NULL,&list_value) != JUMPLISTREG_OK) {
		list_value = snewn(2, char);
		*list_value = '\0';
		*(list_value + 1) = '\0';
	}
	return list_value;
}

/*
* Recursively delete a registry key and everything under it.
*/
static void registry_recursive_remove(HKEY key)
{
	DWORD i;
	char name[MAX_PATH + 1];
	HKEY subkey;

	i = 0;
	while (RegEnumKey(key, i, name, sizeof(name)) == ERROR_SUCCESS) {
		if (RegOpenKey(key, name, &subkey) == ERROR_SUCCESS) {
			registry_recursive_remove(subkey);
			RegCloseKey(subkey);
		}
		RegDeleteKey(key, name);
	}
}

void cleanup_all(void)
{
	HKEY key;
	int ret;
	char name[MAX_PATH + 1];

	/* ------------------------------------------------------------
	* Wipe out the random seed file, in all of its possible
	* locations.
	*/
	access_random_seed(DEL);

	/* ------------------------------------------------------------
	* Ask Windows to delete any jump list information associated
	* with this installation of PuTTY.
	*/
	clear_jumplist();

	/* ------------------------------------------------------------
	* Destroy all registry information associated with PuTTY.
	*/

	/*
	* Open the main PuTTY registry key and remove everything in it.
	*/
	if (RegOpenKey(HKEY_CURRENT_USER, PUTTY_REG_POS, &key) ==
		ERROR_SUCCESS) {
			registry_recursive_remove(key);
			RegCloseKey(key);
	}
	/*
	* Now open the parent key and remove the PuTTY main key. Once
	* we've done that, see if the parent key has any other
	* children.
	*/
	if (RegOpenKey(HKEY_CURRENT_USER, PUTTY_REG_PARENT,
		&key) == ERROR_SUCCESS) {
			RegDeleteKey(key, PUTTY_REG_PARENT_CHILD);
			ret = RegEnumKey(key, 0, name, sizeof(name));
			RegCloseKey(key);
			/*
			* If the parent key had no other children, we must delete
			* it in its turn. That means opening the _grandparent_
			* key.
			*/
			if (ret != ERROR_SUCCESS) {
				if (RegOpenKey(HKEY_CURRENT_USER, PUTTY_REG_GPARENT,
					&key) == ERROR_SUCCESS) {
						RegDeleteKey(key, PUTTY_REG_GPARENT_CHILD);
						RegCloseKey(key);
				}
			}
	}
	/*
	* Now we're done.
	*/
}
